Chemical Equation Review: Question Preview (ID: 29868)

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What coefficients are needed to balance: ____NaCl ---) _____Na + ___Cl2
a) 1,1,1
b) 2,2,2
c) 2,2,1
d) 1,1,2

When you balance a chemical equation what are NOT allowed to change?
a) coeffients
b) subscripts
c) formulas
d) superscripts

Where is the coefficient written in a chemical formula?
a) in front of the unit or formula
b) at the end of the unit or formula
c) in the middle of the formula
d) below the formula

If you have 16 oxygen atoms on the reactant side how many oxygen atoms will be present on the product side?
a) 2
b) 4
c) 8
d) 16

How many atoms are present in 2NaC2H3O2?
a) 8
b) 16
c) 12
d) 20

What type of chemical reaction occurs when two substances combine to form another substance?
a) synthesis
b) decomposition
c) single displacement
d) double displacement

What does the law of conservation of mass tell us about the mass products compared to the mass of the reactants?
a) there is no relationship
b) the masses are equal
c) the mass of the products is greater
d) the mass of the reactants is greater

What type of chemical reaction gives off heat?
a) flammable
b) nonflammabe
c) endothermic
d) exothermic

The numbers that precede symbols and formulas in a chemical equation are called
a) catalysts
b) superscripts
c) subscripts
d) coeffecients

Which would be an example of decomposition?
a) element + element --) compound
b) compound --) element + element
c) compound + element --) compound + element
d) compound + compound --) compound + compound

What type of reaction occurs when one substance breaks down into two or more simpler substances?
a) synthesis
b) displacement
c) decompostion
d) endothermic

In what type of chemical reaction does one element replace another element?
a) single displacement
b) double displacement
c) synthesis
d) decomposition

How many oxygen atoms are present in Mg3(PO4)2
a) 4
b) 12
c) 24
d) 8

How do you know if an equation is balanced?
a) Science
b) Same types of elements on both sides of equation
c) Same formulas on both sides of the equation
d) Same number of each type of atom on each side of the equation

What kind of chemical reaction has the same number of atoms of each element on both sides of the equation?
a) complex
b) simple
c) balanced
d) unbalanced

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